This seems to have a direct link to the on-and-off beef that the rapper has with Jay-Z. According to HollywoodLife, source told Star:

“Kanye arranged for Kim to take vocal lessons from Cardi B, which is interesting because Cardi isn’t really a singer… Kanye can’t stand that Jay-Z and Beyoncé’stour is doing so well. He wants to show them up and figures Kim could be his secret weapon.”

It would be extremely difficult for Kardashian and West to compete with Jay-Z and Beyoncé, even the insider thinks so! “It’s so desparate, but what else would you expect from Kim and Kanye,” the source added.